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I've used them all, and have not had any problems. Alamo tends to have longer waits to process you when you pick up your car.

If you've got any of their premium cards (Avis Preferred, etc.), go with that one. Also, sign up for their 'last minute specials' emails. I was able to save $40 on a 2-week rental and move up a car size when I was out there earlier this month.

I have also heard of long waits at Alamo (one hour!) and that alone would deter me, if the rates and 2nd driver policy are the same.

The person I know that waited an hour did so because they believed they were only paying 10 cents for the week's rental, due to a package deal through their travel agent or condo booking. Having the package rate broken down like that - only a dime for a rental car - probably made the wait more bearable.

Personally, if it's only a $5 difference, I'd go with Avis who in my experience always gets me on my way quite speedily and with a smile too!

I rent from Alamo quite often and never had a bad experience or had to wait more than 15 minutes when it was crowded. I generally use Alamo, Budget or Thrifty, depending on who has the lowest rate for the vehicle I want. This time I am renting from Alamo with a Contract ID of 430710 and a Rate Code of BY and I'm getting a free additional driver for a mid-size. Thrifty with a code of AU11 was cheapest for Jeeps. Alamo was cheapest for convertibles.